Manage your genders using eselect.

gender.eselect

# -*-eselect-*-  vim: ft=eselect
# Copyright 2005-2020 Gentoo Authors
# Distributed under the terms of the GNU GPL version 2 or later

DESCRIPTION="Manage available genders"
MAINTAINER="transagenda@gentoo.org"
VERSION="42"

find_genders() {
    local f
    for f in "${EROOT}"/usr/share/genders/*; do
        [[ -f ${f} ]] && basename "${f}"
    done
}

set_gender() {
    local gender=$1

    if is_number "${gender}"; then
        local genders=( $(find_genders) )
        [[ ${gender} -ge 1 && ${gender} -le ${#genders[@]} ]] \
            || die -q "Number out of range: $1"
        gender=${genders[gender-1]}
    fi

    if [[ "none" != ${gender} ]]; then
        echo "${gender}" > "${EROOT}/etc/conf.d/gender"
    fi
}

remove_gender() {
    rm -f "${EROOT}/etc/conf.d/gender"
}

### show action ###

describe_show() {
    echo "Show the current configured gender"
}

do_show() {
    write_list_start "Current gender:"
    if [[ -e ${EROOT}/etc/conf.d/gender ]]; then
        local gender=$(< "${EROOT}/etc/conf.d/gender")
        write_kv_list_entry "${gender%/}" ""
    else
        write_kv_list_entry "(none)" ""
    fi
}

### list action ###

describe_list() {
    echo "List available genders"
}

do_list() {
    local i genders=( $(find_genders) )

    write_list_start "Available genders:"
    for (( i = 0; i < ${#genders[@]}; i++ )); do
        local gender=$(cat ${genders[i]})
        # highlight the target where the symlink is pointing to
        [[ -e "${EROOT}/etc/conf.d/gender" && \
        ${genders[i]} = $(< "${EROOT}/etc/conf.d/gender") ]] \
            && genders[i]=$(highlight_marker "${genders[i]}")
    done
    write_numbered_list -m "(none found)" "${genders[@]}"
}

### set action ###

describe_set() {
    echo "Set a new gender"
}

describe_set_parameters() {
    echo "<gender>"
}

describe_set_options() {
    echo "gender : Gender name or number (from 'list' action)"
}

do_set() {
    [[ -z $1 ]] && die -q "You didn't tell me what your gender is"
    [[ $# -gt 1 ]] && die -q "Too many parameters"

    if [[ -e ${EROOT}/etc/conf.d/gender ]]; then
        # existing gender
        remove_gender || die -q "Couldn't remove existing gender"
        set_gender "$1" || die -q "Couldn't set a new gender"
    else
        set_gender "$1" || die -q "Couldn't set a new gender"
    fi
}

To use this:

1. Save this file as /usr/share/eselect/modules/genders.eselect
2. Create the directory /usr/share/genders
3. Create files under /usr/share/genders for each of your genders (e.g. /usr/share/genders/female)
4. Run eselect gender list to check that everything works.